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Q.

NCl3 molecules is pyramidal and BCl3 molecule is planar because

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a

B-Cl bond is more polar than N-Cl bond

b

BCl3 does not contain unused electron pair while NCI3 does

c

N-Cl bond is more covalent than B-Cl bond.

d

Boron atom is smaller than nitrogen atom.

answer is B.

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Detailed Solution

BCl3 does not contain any lone pair, so it is trigonal planar. NCl3 has one lone pair of electron. Due to lp-bp repulsion, it acquires pyramidal shape.

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